Gaiter seal and working head of a device or machine for producing and/or treating containers, said working head comprising such a gaiter seal

ABSTRACT

A gaiter seal for shielding a functional element of a container-processing machine extends between parts of a working head of the container-processing machine includes axially-adjacent gaiter modules that extend along an axis and support-and-sliding elements at interfaces between adjacent gaiter modules. The support-and-sliding elements radially support and guide the first and second gaiter-modules along the functional element.

The invention relates to a gaiter or a gaiter seal according to the preamble of claim 1 and to a working head according to the preamble of claim 10.

With current filling machines or filling systems which are used in particular for filling still wine or sparkling wine and in which the fill level is set according to the so-called Trinox method using a Trinox tube at each of the filling elements, the axial range of height adjustment of the Trinox tube that is necessary for setting or forming the fill level is currently protected by a sterilisable protected space inside the housing of the filling element which is used. Even with this configuration however, when adjusting the fill level, a partial upper length of the Trinox tube cannot be prevented from moving from an unsterile into a sterile region of the filling element, something which is often not accepted if only because of the risk of even just a suspected contamination of the filled product with bacteria from the environment. This problem could generally be resolved by the range of adjustment of the Trinox tube, i.e. that part of the length of the tube or other axially adjustable rod-shaped or tubular functional element which projects upward out of the respective filling element, being supported by a gaiter or a gaiter seal which surrounds this functional element. However the problem then is that gaiters which exceed a certain length tend to buckle under movement. This behaviour occurs in particular when changing pressures in general, and vacuum in particular, are applied to the interior of the gaiter seal.

Gaiter seals which are optimally designed, for example, to also withstand a vacuum in their interior usually have a certain dimensional ratio relative to their inside diameter, to the size of their extendible length variation, to their wall thickness, to the maximum vacuum, choice of materials etc. As a result, the manufacturer or operator of a device or machine for producing and/or treating containers would be required to stock a large number of very different gaiter seals, involving considerable expense.

A gaiter seal according to claim 1 is configured to remove this disadvantage and to provide gaiter seals with different lengths that are adapted to suit the respective requirements at no additional expense. The process or working head which has such a gaiter seal is the subject-matter of claim 10.

The inventive gaiter seal comprises at least two individual gaiter modules lying axially adjacent to one another and tightly connected to one another along the gaiter axis so as to form the respective gaiter seal, and provided for example in a standard size. Since each individual gaiter module inherently possesses sufficient stability, by making an appropriate choice of the number of these individual gaiter modules the length of the gaiter seal can be matched to the respective requirements without compromising the stability of the gaiter seal overall.

Between the ends of the gaiter seal is preferably provided at least one sliding and supporting element which, if provided in the interior of the gaiter, is radially supported off the at least one rod-shaped and/or tubular functional element surrounded by the gaiter seal or is supported outside the gaiter seal by a guide. The at least one sliding and supporting element is preferably arranged at the interface between the axially adjacent individual gaiter modules. As to their axial length, inside diameter, size of the extendible length variation, wall thickness, choice of material etc., the individual gaiter modules supported by the at least one sliding and supporting element can be readily manufactured in such a way that they withstand the loads which occur during the particular application. It is then also possible to produce the gaiter seal in any required length by using an appropriate number of individual gaiter modules, and with the stability needed for the loads which occur during the particular application.

The at least one sliding and supporting element, especially the sliding and supporting element that is provided inside the gaiter seal, is preferably part of at least one individual gaiter module or is an independent component that is designed for example in the shape of a disc or plate and placed and/or accommodated in at least one of the gaiter seal's individual gaiter modules.

As well as a first opening for the passage of the rod-shaped and/or tubular functional element, the sliding and supporting element provided inside the gaiter seal also comprises at least one passage connecting the individual gaiter modules to allow the flow of a gaseous and/or vaporous and/or liquid medium, in particular also for a cleaning and/or sterilising agent for treating the inner surfaces of the gaiter seal and the outer surface of the rod-shaped and/or tubular functional element. This passage, which is preferably formed by at least one second opening, is inclined by its axis that is relevant for the flow of the gaseous and/or vaporous and/or liquid medium relative to the longitudinal axis of the gaiter seal or of the functional element such that a swirling motion occurs in this medium inside the gaiter seal in particular when a cleaning and/or sterilising agent flows through it, thereby intensifying an internal cleaning and/or internal sterilisation. A plurality of second openings are, for example, provided distributed around the first opening.

The ends or end faces of the individual gaiter modules are preferably designed so that they are connected to other individual gaiter modules directly, e.g. by connecting sections or coupling sections, or indirectly, e.g. by connecting pieces or intermediate pieces. The connection is made preferably by screw-fastening to the end faces of the individual gaiter modules or to connecting sections or coupling sections configured on the end faces, or by clamping or bracing to these sections. The sliding and supporting elements are preferably formed by coupling sections or by connecting pieces or intermediate pieces.

The inventive gaiter seal forms around the rod-shaped and/or tubular functional element a flexible channel (for example a ring channel or annular space) which facilitates an axial adjustment of this functional element, for example of a rod-shaped probe or of a Trinox tube of a filling element, without a sliding seal. A gas exchange is possible between the individual gaiter modules. The gaiter seal also permits the passage of fluid over its entire length to facilitate a complete cleaning and/or disinfection, in particular also for CIP cleaning and/or disinfection of its inner surfaces, and in any length condition.

If the gaiter seal is part of a filling element, then during the filling process it may be expedient for the channel (for example ring channel or annular space) formed between the rod-shaped and/or tubular functional element and the inner surface of the gaiter seal to be completely excluded from the filling process, for example to be applied with a sterile gaseous medium at a reduced operating pressure, e.g. at an operating pressure of 3 bar maximum.

The purging of the flexible channel during cleaning and/or disinfection is then effected for example with the inclusion of process paths or process channels of the working head, for example of the filling element, or of the filling machine, or again using separate connections through which the cleaning medium and/or disinfectant is supplied and/or discharged.

Because the inventive gaiter seal possesses a high degree of stability, especially against buckling, it can also be used to pre-tension or press the respective rod-shaped and/or tubular functional element when in an initial position for example against an upper height-adjustable stop, this being achieved by the inherent elasticity of the gaiter seal and/or by applying an internal pressure to said seal. An externally arranged spring for example can also be arranged here to provide support. If the filling process requires a vacuum inside the gaiter seal then the seal can also be connected to the adjustable stop.

For the purpose of the invention, ‘containers’ are in particular cans, bottles, drums, also kegs, tubes, pouches, made from metal, glass and/or plastic, and other packages suitable for filling liquid or viscous products.

For the purpose of the invention, the expression ‘container present in sealed position against the treatment head or filling element’ means that the respective container lies with its container mouth pressed tightly up against the treatment head or filling element or against a seal that is located there, in the manner known to a person skilled in the art.

For the purpose of the invention the expressions “essentially”, “in essence” or “around” mean variations from the respective exact value by +/−10%, preferably by +/−5% and/or variations in the form of changes insignificant for the function.

Further embodiments, advantages and possible applications of the invention arise out of the following description of embodiments and out of the figures. All of the described and/or pictorially represented attributes whether alone or in any desired combination are fundamentally the subject matter of the invention independently of their synopsis in the claims or a retroactive application thereof. The content of the claims is also made an integral part of the description.

Further embodiments of the invention are the subject-matter of the dependent claims. The present invention is explained further below in conjunction with the figures and by reference to embodiments. In the figures:

FIG. 1 shows a simplified sectional view of a filling element of a filling system or of a filling machine which has an inventive gaiter seal;

FIG. 2 shows a simplified sectional view of a tubular functional element of the filling element of FIG. 1 which is height-adjustable in its axial direction, together with the inventive gaiter seal that surrounds this functional element;

FIG. 3 shows a plurality of individual gaiter modules forming the gaiter seal of FIGS. 1 and 2;

FIG. 4 shows a section on line I-I of FIG. 3;

FIG. 5-8 each show a simplified sectional view of further filling elements which have the inventive gaiter seal

FIG. 9-11 show views similar to FIGS. 2-4 of a further embodiment of the inventive gaiter seal;

FIG. 12-14 show views similar to FIGS. 2-4 of a further embodiment of the inventive gaiter seal;

FIG. 15-17 show views similar to FIGS. 2-4 of a further embodiment of the inventive gaiter seal;

FIG. 18-20 show views similar to FIGS. 2-4 of a further embodiment of the inventive gaiter seal;

In FIG. 1, 1 is a filling element for filling containers 2, e.g. in the form of bottles, with a liquid product. Filling element 1 is provided, in the manner known to a person skilled in the art, together with a plurality of similar filling elements 1 on a rotor 3 of a filling machine or of a filling system, which rotor 3 can be driven to rotate about a vertical machine axis; in a filling element housing 1.1, filling element 1 forms inter alia a liquid channel 4 which when the containers 2 are being filled is connected to liquid space 5.1 of a product tank 5 provided for all filling elements 1 on rotor 3 and forms on the underside of the filling element 1 a delivery opening 6 through which the product is delivered into respective container 2 controlled by a liquid valve 7. Different gas paths 9 controlled by control valves 8 are also configured in filling element housing 1.1; these are connected inter alia to ring channels 3.1 on rotor 3 and are controlled in the manner known to a person skilled in the art with control valves 8 for different filling methods or filling processes.

Each filling element 1 also comprises a tubular functional element 10 which is adjustable in its axial direction, i.e. along a vertical filling element axis FA, and which in the embodiment shown in FIG. 1 is a tube, e.g. a Trinox tube, that determines the fill level, i.e. the height of the product level in container 2 at the end of the filling process. During filling, this Trinox tube passes through the container opening of container 2 that is present in sealed position against filling element 1, and into its interior. At the end of the respective filling process, pressure is applied to the head space of filled container 2 that is not occupied by product so as to return surplus product through the Trinox tube back to product tank 5 until the lower open end of the Trinox tube is above the product level in container 2 so that the exact product level is set in this way.

The passage of functional element 10 through filling element housing 1.1 is sealed off, but functional element 10 is axially adjustable and projects by a considerable partial length 10.1 above the top of filling element housing 1.1. During an axial height adjustment (double arrow A) of functional element 10, in order to prevent bacteria from being entrained by functional element 10 from the environment into the interior of filling element housing 1.1, i.e. in particular into gas and liquid paths or gas and liquid spaces which are present therein, partial length 10.1 of functional element 10 that runs between filling element housing 1.1 and an upper valve block 11 is surrounded by a gaiter seal 12 which is configured as a gaiter and which in the depicted embodiment is arranged with its longitudinal axis coaxially or essentially coaxially with axis FA. Valve block 11 also executes the height adjustment of functional element 11.

As FIGS. 2 and 3 show with particular clarity, gaiter seal 12 consists of multiple, i.e. in the depicted embodiment of three, tightly interconnected individual gaiter modules 13 that are axially adjacent on filling element axis FA; the number of individual gaiter modules 13 may differ from this and is determined by the total length of gaiter seal 12 that is required in the particular case. In the depicted embodiment, individual gaiter modules 13 are identically configured and each comprise an upper (as shown in FIGS. 2 and 3) annular connecting section or coupling section 13.1 with a female thread, a lower (as shown in FIGS. 2 and 3) disc-shaped connecting section or coupling section 13.2 which is configured with a male thread to fit the female thread of coupling section 13.1, and lying between said coupling sections a gaiter section 13.3 which enables the length of gaiter seal 12 to be varied.

Individual gaiter modules 13 are produced preferably as a single moulding from at least one suitable material, preferably plastic. Gaiter section 13.2 with a central opening 14, with which coupling section 13.2 and hence also gaiter seal 12 is supported on functional element 10 and guided on the latter, so that each coupling section 13.2 also forms a sliding and supporting element of gaiter seal 12. Coupling section 13.2 also comprises a plurality of openings 15 which are distributed around opening 14, which form passages and which are used, in the manner described in more detail below, for cleaning or purging an annular space 19 formed between the outer surface of the functional element and the inner surface of gaiter seal 12 that is at a distance away from said outer surface.

With the use of additional sealing rings 16, individual gaiter modules 13 are connected to one another to form gaiter seal 12 by screwing a coupling section 13.2 to a coupling section 13.1 in each case.

The lower end (as shown in FIGS. 1 and 2) of gaiter seal 12 is also screw-fastened to filling element housing 1.1 with the use of a sealing ring 16; in the case of the depicted embodiment this is done by screwing lower coupling section 13.2 into the female thread of an opening 17 of a gas channel of gas paths 9. In the depicted embodiment the upper end of gaiter seal 12 is attached to a connector 18 on valve block 11 with the use of a sealing ring 16 by screw-fastening upper coupling section 13.1.

The modular configuration of gaiter seal 12 allows it to be produced with different axial lengths and so adapted to the respective length of part-section 10.1 and to the adjustment travel of functional element 10. A radial or lateral deviating or buckling of gaiter seal 12 is effectively prevented in particular by the radial supporting and guiding of individual gaiter modules 13 with their coupling sections 13.2 on functional element 10, and even if the seal is of considerable length.

A pressure corresponding to or slightly above normal ambient pressure is preferably present in annular space 19 during normal filling operation. In particular, during normal filling operation annular space 19 is separated from gas paths but is preferably filled with a sterile gaseous and/or vaporous medium. Filling element 1 is also configured however so that during the cleaning and disinfection of the filling machine or filling elements 1, and preferably during so-called CIP cleaning, the liquid cleaning medium and disinfectant used for this purpose can flow through annular space 19. Filling element 1 is provided for this purpose with two valves 20 and 21 located in valve block 11, by which the height adjustment of functional element 10 is also effected according to arrow A; of these valves, valve 21 is always closed during normal filling operation and valve 20 is open during normal filling operation when gas and/or product is to be discharged from container 2 through functional element 10 and returned to product tank 5, for example during the final setting of the fill level in container 2 by way of functional element 10 used as a Trinox tube.

During the cleaning and/or disinfection of the filling machine and filling elements 1 and in particular of respective annular space 19 as well, both valves 20 and 21 are open so that the liquid cleaning medium and/or disinfectant can enter annular space 19 for example through a gas path 9 in filling element housing 1.1, flow through it and then flow through the two open valves 20 and 21 and connection 22 that is connected to gas space 5.2 of the product tank back to that tank. In order to achieve optimal cleaning and/or disinfection on all surfaces adjoining annular space 19, and in particular on the folds of gaiter seal 12, openings 15 through which the cleaning medium and/or disinfectant flows are preferably configured at an angle so as to obtain a swirling motion of the liquid cleaning medium and/or disinfectant which intensifies the cleaning and/or disinfection as it flows through annular space 19.

If during production, i.e. during normal filling operation, annular space 19 is totally excluded from the filling process, then this avoids gaiter seal 12 being subjected to a high internal pressure which would be up to 7 bar during the bottling of sparkling wine for example. Gaiter seal 12 could only be realised as a very complex and expensive component under these conditions. Only a reduced operating pressure of the order of around 3 bar maximum for example is applied to annular space 19 during cleaning and/or disinfection. Since annular space 19 is not involved in the gas processes, in particular during production, there are also no additional gas losses.

To avoid gas bubbles forming in annular space 19 during CIP cleaning and/or CIP disinfection, before the liquid cleaning medium and/or disinfectant is introduced into annular space 19 it is expedient for gaiter seal 12 to be placed in a state of minimal length, i.e. in the depicted embodiment valve block 11 is moved to its lowest position. As the length of gaiter seal 12 increases, annular space 19 is then increasingly filled up with the cleaning medium and/or disinfectant so that the folds in gaiter seal 12 are also optimally included in the cleaning and/or disinfection process as a result.

Gaiter seal 12 or its individual gaiter modules 13 as well as coupling sections 13.1 and 13.2 and gaiter section 13.3 have a cross-section that is considerably larger than the cross-section of functional element 10, so that annular space 19 between gaiter seal 12 and functional element 10 also possesses a sufficiently large cross-section, and so during the cleaning and/or disinfection of filling element 1 the liquid cleaning medium and/or disinfectant can flow through it with no, or no essential, loss of pressure and the creation of the swirling motion that intensifies the cleaning and/or disinfection of all inner surfaces of annular space 19 is possible. Annular coupling sections 13.1 and 13.2 are essentially rigid in configuration, and are in any event far less elastic than gaiter section 13.3 that lies between them. When individual gaiter modules 13 are configured as single pieces, this is achieved by coupling sections 13.1 and 13.2 having a greater material cross-section compared with gaiter section 13.3.

In this embodiment, valve block 11 also forms the part of filling element 1 that is connected to functional element 10 and that moves with that functional element.

In a view similar to FIG. 1, FIG. 5 shows as a further embodiment a filling element 1 a which in essence only differs from filling element 1 in that only valve 20 that is used as a Trinox valve, i.e. that controls functional element 10, is provided in valve block 11 and the upper end of annular space 19 is permanently connected by a connection 22.1 and a gas path 9 to a ring channel 3.1 which is provided on rotor 3 and which for example is at ambient pressure or at a certain positive pressure and preferably carries a sterile gas or an inert gas (such as CO₂). For the cleaning and/or disinfection of annular space 19, the liquid cleaning medium and/or disinfectant is delivered from the process paths of filling element 1 a and leaves annular space 19 through the line or connection 22.1.

As a further possible embodiment, FIG. 6 shows a filling element 1 b which only differs from filling element 1 a in that the upper end of annular space 19 is not permanently connected by connection 22.1 to a ring channel 3.1 of rotor 3 but to an additional ring channel 3.2 on rotor 3 provided for all filling elements 1 b.

As a further possible embodiment, FIG. 7 shows a filling element 1 c which differs from filling elements 1,1 a-1 b in that tubular functional element 10 which is axially height-adjustable, i.e. it can move on filling element axis FA, is a filling tube which can be connected under control to liquid space 5.1 of product tank 5 by way of valve 20 provided in valve block 11 and product line 22. In this embodiment, annular space 19 of gaiter seal 12 is permanently connected to a channel 3.1 which is configured on rotor 3 and which during the filling process is at ambient pressure, preferably carrying an inert gas at ambient pressure or at a low positive pressure, for example at a pressure of 3 bar maximum. During the filling process valve 21 is again always closed so that annular space 19 is isolated from process paths, i.e. from product line 23. During cleaning and/or disinfection the liquid cleaning medium or disinfectant, which for example is delivered from product tank 5 and discharged through ring channel 3.1 or vice versa, flows through annular space 19 with valves 20 and 21 open.

In a view similar to FIG. 1, FIG. 8 shows as a further embodiment a filling element 1 d in which rod-shaped functional element 10 is an electric probe which determines the fill level and is again axially adjustable (double arrow A) and whose upper partial length extending out of filling element housing 1.1 is surrounded by gaiter seal 12. The functional element configured as an electric probe is contacted for connection with the (not depicted) control electronics (contact 28) for example inside gaiter seal 12 or inside connector 18 which is produced preferably from an electrically non-conductive material.

Together with height-adjustable functional element 10, FIG. 9-11 show as a further embodiment a gaiter seal 12 a which also comprises multiple, i.e. in the depicted embodiment three, individual gaiter modules 13 a which succeed one another along filling element axis FA and are tightly interconnected. These only differ in essence from individual gaiter modules 13 in that individual gaiter modules 13 a each comprise at either end an annular coupling section 13.1 with female thread. Annular, male-threaded coupling elements or intermediate pieces 13.4 which comprise openings 14 and 15 and act as sliding or support elements are provided to connect individual gaiter modules 13 a. Individual gaiter modules 13 a which succeed one another axially are each screwed to one another by way of a coupling element 13.4. The upper end of gaiter seal 12 a is in turn connected to connector 18 of valve block 11 by screwing on upper coupling section 13.1. The lower end of gaiter seal 12 a is connected to filling element housing 1.1 by screwing lower coupling section 13.1 onto a male thread of said filling element housing. Sealing rings 16 each ensure a tight connection.

In views similar to FIG. 2-4, FIG. 12-14 show as a further embodiment inter alia a gaiter seal 12 b which again comprises a plurality of individual gaiter modules 13 b which succeed one another axially, i.e. along filling element axis FA, and are tightly interconnected. These gaiter modules 13 b only differ in essence from individual gaiter modules 13 in that instead of connecting sections or coupling sections 13.1 and 13.2, each individual gaiter module 13 b comprises annular coupling sections 13.5 and 13.6 arranged coaxially with the longitudinal axis of gaiter seal 12 b and between which gaiter section 13.3 is again formed and of which coupling section 13.6 is configured disc-like with openings 14 and 15 and so acts as a sliding and supporting element of gaiter seal 12 b for support on functional element 10. Coupling sections 13.5 and 13.6 are each executed with a radially projecting flange. Axially adjacent individual gaiter modules 13 b which form gaiter seal 12 b are connected to one another by screw-fastening (screws 24 and nuts 25) and braced on these flanges; sealing rings 16 are used to seal off the interface between two axially adjacent individual gaiter modules 13 b. In similar fashion the upper end of gaiter seal 12 b is attached to connector 18 and the lower end of gaiter seal 12 b to filling element housing 1.1 also by screw-fastening (screws 24), again using a sealing ring 16 to seal off the interface concerned.

In a view similar to FIG. 2-4, FIG. 15-17 show as a further embodiment a gaiter seal 2 c which also consists of a plurality of axially adjacent individual gaiter modules 13 c. Individual gaiter modules 13 c are executed in the same way as individual gaiter modules 13 b, although coupling sections 13.5 and 13.6 have no openings for screws 24. Instead, with gaiter seal 12 c, individual gaiter modules 13 c are interconnected by way of straps 26 each comprising a C-section which is open toward filling element axis FA and which has sides that engage behind the radially projecting flanges configured on coupling sections 13.1 and 13.2 on faces of a tapered ring. The upper and the lower end of gaiter seal 12 c are also held on connector 18 or the top of filling element housing 1.1 in the same way; for this purpose connector 18 and filling element housing 1.1 are each configured with an annular flange 27 which concentrically surrounds filling element axis FA and behind which strap 26 engages.

In a view similar to FIG. 2-4, FIG. 18-20 show as a further embodiment a gaiter seal 12 d which also comprises multiple, i.e. in the depicted embodiment three, axially adjacent and tightly interconnected individual gaiter modules 13 d which only differ in essence from individual gaiter modules 13 b in that each individual gaiter module 13 d comprises coupling sections 13.5 at both ends. Between two individual gaiter modules 13 d which are axially connected to one another by screw-fastening (screws 24 and nuts 25) is provided a disc-shaped intermediate piece 13.7 which is set into axially adjacent individual gaiter modules 13 d and forms a sliding and supporting element of gaiter seal 12 d. Gaiter seal 12 d is attached to connector 18 and to the top of filling element housing 1.1 by screw-fastening as described in relation to gaiter seal 12 b.

Gaiter seals 12 a-12 d can be used in the same way as gaiter seal 12, especially with filling elements 1, 1 a-1 c.

The invention has been described hereinbefore by reference to different embodiments. It goes without saying that the invention is not limited to these embodiment examples. The inventive gaiter seal is generally also suitable for other machines or their treatment heads, especially in the drinks industry where to ensure a process that is as sterile as possible it is important to shield an axially movable or adjustable rod-shaped or tubular functional element from outside influences or external contamination. In particular, unlike the described embodiments, the rod-shaped or tubular functional element that is surrounded by the gaiter seal can be a stretching mandrel of a working head or of a mould of a stretch blow moulding machine for producing containers from plastic (PET) or a stretching/filling mandrel of a working head of a so-called LBO machine, i.e. of machines for stretch moulding containers 2 using a liquid medium, for example a filled product. Again, it is also generally possible to configure the sliding and supporting elements of the gaiter seal for supporting on at least one outer guide, even though the described supporting on the rod-shaped and/or tubular functional element constitutes the more optimal solution.

REFERENCE LIST

1, 1 a-1 c Filling element

1.1 Filling element housing

2 Container

3 Rotor

3.1, 3.2 Ring channel on rotor 3

4 Liquid channel

5 Filled product container

5.1 Liquid space

5.2 Gas space

6 Delivery opening

7 Liquid valve

8 Control valve

9 Gas paths

10 Functional element

10.1 Part-section

11 Valve block

12,12 a-12 d Gaiter seal

13,13 a-13 d Individual gaiter module

13.1,13.2 Coupling section

13.3 Gaiter section

13.4 Intermediate or connecting piece

13.5,13.6 Coupling section

13.7 Intermediate piece

14,15 Opening

16 Sealing ring

17 Opening

18 Connector

19 Annular space

20,21 Valve

22,22.1 Connection

23 Product line

24 Screw

25 Nut

26 Strap

27 Flange

28 Contact

A Adjustment stroke

FA Axis of the functional element 

1-12. (canceled)
 13. An apparatus comprising a gaiter seal for shielding a functional element of a container-processing machine, wherein said functional element is one of rod-shaped and tubular, wherein said gaiter seal extends between parts of a working head of said container-processing machine, wherein said gaiter seal surrounds said functional element at a distance therefrom, wherein said gaiter seal comprises gaiter modules and support-and-sliding elements, wherein said gaiter modules extend along an axis, wherein said gaiter modules are axially adjacent to each other, wherein said gaiter modules comprises a first gaiter-module and a second gaiter-module that is adjacent to said first gaiter-module, wherein said support-and-sliding elements comprise a first support-and-sliding element, wherein said first support-and-sliding element is disposed at an interface between said first and second gaiter-modules, wherein an interconnection connects said first and second gaiter-modules at said interface, and wherein said first sliding-and-supporting element is configured for radially supporting and guiding said first and second gaiter-modules along said functional element.
 14. The apparatus of claim 13, wherein said first supporting-and-sliding element and said first gaiter-module form a unitary structure.
 15. The apparatus of claim 13, wherein said first supporting-and-sliding element comprises an intermediate piece that is arranged to be at said interface.
 16. The apparatus of claim 13, wherein said first gaiter-module comprises a first coupling-section, a second coupling-section, and a gaiter section disposed between said first and second coupling-sections, and wherein said first and second coupling-sections are disposed at corresponding first and second ends of said first gaiter-module.
 17. The apparatus of claim 13, wherein said gaiter seal further comprises rings disposed at ends of said first gaiter-module, wherein one of said rings couples said first gaiter-module to said second gaiter-module, and wherein said first gaiter-module further comprises a gaiter section between said rings.
 18. The apparatus of claim 13, further comprising a strap that connects said first and second gaiter-modules to each other.
 19. The apparatus of claim 13, further comprising a screw-fastener that connects said first gaiter-module to said working head.
 20. The apparatus of claim 13, wherein said first gaiter-module comprises a coupling section having a female thread and said second gaiter-module comprises a coupling section having a male thread that engages said female thread.
 21. The apparatus of claim 13, wherein said gaiter seal further comprises an intermediate piece for coupling said first and second gaiter-modules to each other, wherein said first gaiter-module comprises a coupling section having a female thread, wherein said second gaiter-module comprises a coupling section having a female thread, and wherein said intermediate piece comprises male threads that engage said female threads of both of said coupling sections.
 22. The apparatus of claim 13, wherein said gaiter seal comprises disk-shaped coupling sections having flanges that extend radially therefrom away from a longitudinal axis of said gaiter seal, and wherein each disk-shaped coupling section connects said first gaiter-module to at least one of said second gaiter-module and said working head by at least one of screwing and bracing.
 23. The apparatus of claim 13, further comprising a coupling section that provides a connection between said first and second gaiter-modules, said coupling section having a first opening through which said functional element passes and a second opening for passage of fluid, said first and second openings being offset from each other.
 24. The apparatus of claim 13, wherein said gaiter seal extends along a gaiter axis, wherein a coupling section that provides a connection between said first and second gaiter-modules includes a first opening and a second opening, and wherein said second opening defines a passage that is angled relative to said gaiter axis.
 25. The apparatus of claim 13, wherein each of said gaiter modules is a single unitary plastic piece.
 26. The apparatus of claim 13, wherein said container-processing machine is a filling machine and wherein said working head comprises a filling element that is one of a plurality of identical filling elements on said filling machine.
 27. The apparatus of claim 13, wherein said container-processing machine is one that expands preforms into containers by filling said preforms with filling product, and wherein said functional element is a stretching mandrel.
 28. The apparatus of claim 13, wherein said functional element comprises a tube that extends into said container during filling thereof and wherein an extent to which said tube extends into said container being indicates a fill level of liquid product in said container.
 29. The apparatus of claim 13, wherein said functional element comprises a rod having an electrical probe at a distal end thereof, wherein said rod extends into said container during filling thereof, wherein an extent to which said rod extends into said container indicates a fill level of liquid product in said container, and wherein said electrical probe is configured to transmit a signal indicative of said liquid product having reached a desired fill level.
 30. The apparatus of claim 13, wherein said gaiter seal defines an annular space between a wall thereof and said functional element, wherein said annular space is connected to a source of fluid, and wherein said fluid is selected from the group consisting of cleaning medium and inert gas.
 31. The apparatus of claim 13, wherein said working head comprises a process path, wherein said gaiter seal defines an annular space between a wall thereof and said functional element, and wherein said annular space is permanently open to said process path.
 32. The apparatus of claim 13, wherein said working head comprises a process path and a valve, wherein said gaiter seal defines an annular space between a wall thereof and said functional element, and wherein said valve selectively connects said annular space to said process path. 